Adjustable form clamp



May 29, 1923.

G. E. GREENWOOD ADJUSTABLE FORM CLAMP Filed May 10, 1922 111W 01 650865 E 6855 W000. 2) V GEORGE E. GREENWOOD, OF SAN TO HORACE I. WOOLLEY, IR, 01

PATENT QFHCE.

FRANCISCO, CALIFORNIA, ASSIGNOR OF ONE-THIRD ALAMEDA, CALIFORNIA, AND ONE-THIRD T FRED N. VEDDEB, OF SAN FRANCISCO, CALIFORNIA.

ADJUSTABLE Y FORM CLAMP.

Application filed Kay 10, 1922. Serial No. 559,808.

To all whom it may concern:

Be it known that I, Gnonon E. GREEN- woon, a. citizen of the United States, residing at the city and county of San Francisco and State of California, have invented new and useful Improvements in Adjustable Form Clamps, of which the following is a specification.

This invention relates to improvements in clamps adapted for use in clamping together the separable parts of a concrete form or mold and'is especially intended for use as a column clamp to lock together the forms withinwhich concrete columns or the like 1e are molded.

The object of the present invention is to generally improve and simplify clamps of the character described; to render the same adjustable for forms of varying size; to provide a clamp Which may be quickly applied or removed, and to provide a wedge member by which the forms may be drawn up into snug engagement'with relation toeach other and the clamps rigidly secured. Further objects will hereinafter a pear.

One form which my invention may assume is exemplified in the following description and illustrated in the accompanying drawings, in which- Fig. 1 is a perspective view of the form clamp.

Fig. 2 is a side elevation of a column form ShOWlIlg' the application of the clamp.

Fig. 3 is a cross section of Fig. 2 taken above the clamping members.

Referring to the drawings in detail, and particularly to Fig. 1, it will be seen that the clamp consists of two separable sections, as indicated at A and B, and that each section consists of a'pair of arms 2 and 3, which are pivotally connected at one end as at 4. The arm 2 consists of a single bar of strap iron of suitable width and thickness, while the arm 3 consists of two superposed sepa-,

4 rated pieces of strap iron. These strips are separated at one end by introducing the strip 2 as shown at 4, and the opposite ends are maintained in a separated condition by means of spacers 5 and 6, secured by means of rivets or the like, indicated at 7. Such separation is more or less essential as the free ends of the arms are overlapped when thr:l clamp is applied as shown in Figs. 2 an 3.

of the arms.

When applying a clam of this character it is necessary that means 8 by the clamp sections can together, and it is also necessary that the clamps be adjustable so that forms of varying size may be taken care of. With this end in view the pivotal connection formed between the respective pairs of arms is radjustable and this is accomplished by merely perforating or drilling the arms at spaced intervals as indicated at 8. To draw the arms or clamps together. when applied, a series of teeth 9 is formed in the outer ends These teeth are. cut or punched in any suitable manner and are disposed on an angle of substantially 45 with relation to the bars or arms proper. hese teeth are provided for the reception of wedges such-as shown at 10 and 11 and these wedges are driven into place between the teeth when the clamps are applied.

In actual operation, referring'to Figs. 2 and 3, C indicates a concrete column of suitable construction which may or may not be reinforced as the particular type of structure may demand, and 12, 13, 14, and 15, represent the respective sides and ends of the form. These forms are separable with relation to each other and are braced at intervals b means of cleats 16. The forms when assem led are in this instance tied to ether by the clamps, indicated at A and these are preferably placed on top of the cleats 16 to secure the vclamps against vertical movement on the forms. The arms 2 of the respective clamps are passed between the arms 3, as shown in Figs. 1 and 2, and

the wedges .10 and 11, when introduced are tapped with a hammer or other suitable tool, thus causing the respective arms of the clamps to pull the form sections snugly together. After the clamps have been applied, it is obvious that the concrete may be poured and that the concrete will remain 'untll sufiiciently set. The clamps may then be removed whenever desired and the forms are stripped or removed with relation to the e provided wherebe tightly drawn ,and'

columns. This operation being quick and simple as the wedges are readily removed by merely tapping the lower ends thereof.

The several perforations 8 provided per- ,mit a considerable range of adjustment with relation to forms of varying size, and similarly the provision of the several teeth as shown, that isthe several teeth formed permit introduction of the wedges at any point desired.

One of the important features of the present invention Is the sha of'the teethv slots between which the wedges are inserted.

- varying The front of each tooth will in this manner en one side of the wedge, while the back of each tooth will engage'the opposite face of the wedge. The wedges are t us locked against accidental disengagement with the teeth and can only be inserted or removed by vertical movement of the wedges. The square shape of the bottom of each tooth is also of importance as it permits the formation of a wedge, the edges of which are right angular with relation to the respective faces of the wedge, thus giving a largebearing surface, and it further permits wedges of length and any desired taper to be employed.

While certain features of the present in vention are more or, less specifically illustrated, I wish it understood that various changes in form and proportion may be resorted to within the scope of the appended claims, similarly that the materials and finish of the several parts employed may be such as the experience and judgnient of the manufacturer may d ctate or various uses may demand.

Having thus described my invention. what I claim and desire to secure by Letters Patent 1si '1. In a clamp of the characterdescribed Y pivotally connected arms, and teeth formed in the outer ends of the, arms, said teeth having their side walls disposed on an angle of 45? with relation to the longitudinal axis of the arms, and the bottom of said teeth being square and disposedat an angle of 90 with relation .to the sides of the teeth. 4

- a single bar and the other arm-of a pair of .2. In a clamp of the character described a clamp section consisting of a pair of pivot ally connected arms, one arm consisting of superposed bars, means for maintaining a predetermined spacing between said superposed bars, and means permitting longitumesses dinal adjustment of the pivotal-connection between the bars.

3. In a clamp of the character described a clamp section consisting of a pair of pivotally connected arms, one arm consistin g of a single bar and the other arm of a pair of superposed bars, means for maintainingia predetermined spacing between said superposed .bars, means permitting longitudinal adjustment of the pivotal connection between the bars, and teeth formed in the free ends of the bars and along the outer edges thereof, said teeth being disposed on an angle of 45 with relation to the longitudinal axis of the res ctive bars, and the bottom of each tooth eing square and dismember insertible between the teeth of opits arms and guided thereby, said wedge ing so formed as to have two faces ap- I proximately parallel and two converging edgis engageable with the bottom of the teet 5. Ina clamp of the character described, intersecting arms and teeth formed in the outer ends of the arms, said teeth having their bottom walls disposed'on an angle of approximately forty-five degrees with relation to the longitudinal axis of the arms, and said bottom walls presenting substantially flat faces. V I

6. In a clamp of the character described,

ends of the arms, said teeth having their bottom walls disposed on an angle of apintersecting arms, teeth formed'in the outer proximately forty-five degrees with rela-' tion to the longitudinal axis of the arms and presenting flat faces,

and a flat wedge member insertlble between the teeth of opposite arms, said wedge being so formed as tohave two faces approximately parallel and two converging edges which present substantially flat faces and which are engageable with the bottom. faces presented by the teeth.

GEORGE E. onnsuwoon 

